[email protected] 0 Posted September 8 1992 VR6 idle adjustment. My VR6 hasn't got a ECM , shown on top of the bulkhead on my workshop manual. How do I adjust my 400 rpm and lumpy engine sounding as though it is running rich? Quote Share this post Link to post Share on other sites
bahnstorm 1 Posted September 8 Check vcds first,vac leak,bad idle valve,bad plug lead... Quote Share this post Link to post Share on other sites
Dox 31 Posted September 9 Check vcds first,vac leak,bad idle valve,bad plug lead...Check you have the correct plug leads to the coil pack Sent from my iPhone using Tapatalk Quote Share this post Link to post Share on other sites
[email protected] 0 Posted September 14 Thanks for the reply, but what is vcds I have checked all my manuals. As you can see my VW engine knowledge is somewhat limited! but I m not going to give up. Cliff R Quote Share this post Link to post Share on other sites
bahnstorm 1 Posted September 14 Vcds is vag-com,diagnostic software,or a cheap obd scanner might connect to check fault codes Quote Share this post Link to post Share on other sites
Dox 31 Posted September 14 (edited) UK VR6s are OBD1, this precedes OBD2 which scanners are designed to be used on, hence there use is quite limited. are you distributer or coil pack? You need a plug lead removal tool to get the leads off the plugs, yanking on them will damage them. Some cars still have these clipped to the bonnet stay, otherwise it’s eBay I’m afraid. https://ebay.us/m/dJ1JU5 Edited September 14 by Dox Quote Share this post Link to post Share on other sites
bahnstorm 1 Posted September 14 Fault codes can still be read with or without a scan tool,best use a plug lead removal tool as they do break easily,check all the vac and intake pipes post maf as they can be brittle with age Quote Share this post Link to post Share on other sites
fendervg 33 Posted September 16 Idle is really controlled by the ECU along with inputs from all the other sensors - MAF, crank, lambda, cam and ISV and throttle position, a vac leak would usually cause a high idle I think. Even though it's OBD1, you will still get lots of useful info, both in terms of fault codes, if any, and real time stats on what the ECU is seeing. You can also initiate an ECU reset procedure that puts it back into initial learning mode using the software, so I would recommend getting it scanned. Checking all leads and the distributor (92 should be dizzy rather than coil pacl) and the coil would also be a good start. Quote Share this post Link to post Share on other sites
[email protected] 0 Posted September 21 Thanks for your reply. Food for thought and a lot of checking which I"m up for . I will let you know how I get on. Fitted with a dizzy. Quote Share this post Link to post Share on other sites
